function createCookie(name,value,days) 
{
	if (days) 
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) 
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) 
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) 
{
	createCookie(name,"",-1);
}

function setPopupStyle() 
{
	if(!readCookie('wroteIt')) 
	{
		// if cookie not found display the div and create the cookie
		document.getElementById("popupCenter").style.display="block";
		createCookie('wroteIt', 'wroteIt', 1);  // 1 day = 24 hours persistence
	}
	else 
	{
		// if cookie found hide the div
		document.getElementById("popupCenter").style.display="none";
	}
}

document.onclick = check; 
function check(e)
{ 
	var target = (e && e.target) || (event && event.srcElement); 
	var obj = document.getElementById('popupCenter'); 
	if(target!=obj){obj.style.display='none'} 
}